Loops 13

55 talks

July 22, 2013 - July 26, 2013

C13029

Collection TypeConference/School

Source RepositoryPIRSA

DescriptionLoops 13

Displaying 37 - 48 of 55

Discrete Approaches - 2
- Aaron Trout Chatham University
- Philipp Hoehn Okinawa Institute of Science and Technology Graduate University
July 25, 2013

PIRSA:13070075
Phenomenology - 3
- Ivette Fuentes University of Southampton
- Stephon Alexander Brown University
- Astrid Eichhorn University of Southern Denmark
- Djordje Minic Virginia Polytechnic Institute and State University
- Antonino Marciano Fudan University
July 25, 2013

PIRSA:13070073
Phenomenology - 4
- Stefano Bianco Sapienza University of Rome
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Angel Ballesteros Universidad de Burgos
- Hans Westman
July 25, 2013

PIRSA:13070077
Discrete Approaches - 3
- Ghanashyam Date Institute of Mathematical Sciences
- Jacek Puchta University of Warsaw
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sumati Surya Raman Research Institute
July 25, 2013

PIRSA:13070079
Group Field Theory and Tensor Models - 2
- Stephane Dartois École Normale Supérieure de Lyon (ENS Lyon)
- Lorenzo Sindoni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
- Joseph Ben Geloun Laboratoire d'Informatique de Paris-Nord (LIPN)
- Dine Ousmane Samary CEA Saclay
July 25, 2013

PIRSA:13070076
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078
Closing Remarks

July 25, 2013

PIRSA:13070094
Spontaneous Dimensional Reduction?

Steve Carlip University of California, Davis

July 26, 2013

PIRSA:13070070
Diffeomorphism Invariant Gauge Theories

Kirill Krasnov University of Nottingham

July 26, 2013

PIRSA:13070081
Scenes From Polymer Quantization

Viqar Husain University of New Brunswick

July 26, 2013

PIRSA:13070082
Promising Paths: What Have We Learned So Far About Quantum Gravity?
- Abhay Ashtekar Pennsylvania State University
- Carlo Rovelli Aix-Marseille University
July 26, 2013

PIRSA:13070083
Quantum Foundations - 1
- Lee Smolin Perimeter Institute for Theoretical Physics
- Robert Spekkens Perimeter Institute for Theoretical Physics
- Robert Oeckl Universidad Nacional Autónoma De Mexico (UNAM)
- Jonathan Oppenheim University College London
- Markus Müller Institute for Quantum Optics and Quantum Information (IQOQI) - Vienna
July 26, 2013

PIRSA:13070084

Discrete Approaches - 2
- Aaron Trout Chatham University
- Philipp Hoehn Okinawa Institute of Science and Technology Graduate University
July 25, 2013

PIRSA:13070075
Phenomenology - 3
- Ivette Fuentes University of Southampton
- Stephon Alexander Brown University
- Astrid Eichhorn University of Southern Denmark
- Djordje Minic Virginia Polytechnic Institute and State University
- Antonino Marciano Fudan University
July 25, 2013

PIRSA:13070073
Phenomenology - 4
- Stefano Bianco Sapienza University of Rome
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Angel Ballesteros Universidad de Burgos
- Hans Westman
July 25, 2013

PIRSA:13070077
Discrete Approaches - 3
- Ghanashyam Date Institute of Mathematical Sciences
- Jacek Puchta University of Warsaw
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sumati Surya Raman Research Institute
July 25, 2013

PIRSA:13070079
Group Field Theory and Tensor Models - 2
- Stephane Dartois École Normale Supérieure de Lyon (ENS Lyon)
- Lorenzo Sindoni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
- Joseph Ben Geloun Laboratoire d'Informatique de Paris-Nord (LIPN)
- Dine Ousmane Samary CEA Saclay
July 25, 2013

PIRSA:13070076
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078
Closing Remarks

July 25, 2013

PIRSA:13070094
Spontaneous Dimensional Reduction?

Steve Carlip University of California, Davis

July 26, 2013

PIRSA:13070070

Several lines of evidence hint that quantum gravity at distances a bit larger than the Planck scale may become effectively two-dimensional. I will summarize the evidence for this "spontaneous dimensional reduction," and suggest a further argument based on the effect of vacuum fluctuations on light cones. If this description proves to be correct, it suggests an interesting relationship between small-scale quantum spacetime and the behavior of cosmologies near a spacelike singularity.
Diffeomorphism Invariant Gauge Theories

Kirill Krasnov University of Nottingham

July 26, 2013

PIRSA:13070081

I will describe a very large class of gauge theories that do not use any external structure such as e.g. a spacetime metric in their construction. When the gauge group is taken to be SL(2) these theories describe interacting gravitons, with GR being just a particular member of a whole family of gravity theories. Taking larger gauge groups one obtains gravity coupled to various matter systems. In particular, I will show how gravity together with Yang-Mills gauge fields arise from one and the same diffeomorphism invariant gauge theory Lagrangian. Finally, I will describe what is known about these theories quantum mechanically.
Scenes From Polymer Quantization

Viqar Husain University of New Brunswick

July 26, 2013

PIRSA:13070082

A regime of "polymer quantum field theory on curved spacetime" should emerge in a low energy approximation of quantum gravity based on LQG ideas. This era should be characterized by a polymer scale, and give modifications to the usual semiclassical approximation. I will describe work on gravitational collapse, cosmology, and statistical mechanics in this setting. Results include models of horizon evaporation, inflation and graceful exit without an inflaton potential, and an indication of dimensional reduction from 4 to 2.5 dimensions.
Promising Paths: What Have We Learned So Far About Quantum Gravity?
- Abhay Ashtekar Pennsylvania State University
- Carlo Rovelli Aix-Marseille University
July 26, 2013

PIRSA:13070083

In LQG we work in the spirit of Antonio Machado: "Traveler, there is no path; Paths are made by walking." I will present a bird's eye view of some of the paths that have emerged since Loops 11 and offer a few suggestions.

I try to make the point about what we know and what we do not yet know about the possibility of writing a quantum theory of gravity.
Quantum Foundations - 1
- Lee Smolin Perimeter Institute for Theoretical Physics
- Robert Spekkens Perimeter Institute for Theoretical Physics
- Robert Oeckl Universidad Nacional Autónoma De Mexico (UNAM)
- Jonathan Oppenheim University College London
- Markus Müller Institute for Quantum Optics and Quantum Information (IQOQI) - Vienna
July 26, 2013

PIRSA:13070084

Title	Speaker(s)	Date	Talk Type	Info
Discrete Approaches - 2	Aaron Trout, Philipp Hoehn	2013-07-25	Conference	View details
Phenomenology - 3	Ivette Fuentes, Stephon Alexander, Astrid Eichhorn, Djordje Minic, Antonino Marciano	2013-07-25	Conference	View details
Phenomenology - 4	Stefano Bianco, Giovanni Amelino-Camelia, Angel Ballesteros, Hans Westman	2013-07-25	Conference	View details
Discrete Approaches - 3	Ghanashyam Date, Jacek Puchta, Bianca Dittrich, Sumati Surya	2013-07-25	Conference	View details
Group Field Theory and Tensor Models - 2	Stephane Dartois, Lorenzo Sindoni, Joseph Ben Geloun, Dine Ousmane Samary	2013-07-25	Conference	View details
Canonical Quantum Gravity - 4	Suzanne Lanery, Maximilian Hanusch, Yongge Ma	2013-07-25	Conference	View details
Closing Remarks		2013-07-25	Conference	View details
Spontaneous Dimensional Reduction?	Steve Carlip	2013-07-26	Conference	View details
Diffeomorphism Invariant Gauge Theories	Kirill Krasnov	2013-07-26	Conference	View details
Scenes From Polymer Quantization	Viqar Husain	2013-07-26	Conference	View details
Promising Paths: What Have We Learned So Far About Quantum Gravity?	Abhay Ashtekar, Carlo Rovelli	2013-07-26	Conference	View details
Quantum Foundations - 1	Lee Smolin, Robert Spekkens, Robert Oeckl, Jonathan Oppenheim, Markus Müller	2013-07-26	Conference	View details

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Format results

Discrete Approaches - 2

Phenomenology - 3

Phenomenology - 4

Discrete Approaches - 3

Group Field Theory and Tensor Models - 2

Canonical Quantum Gravity - 4

Closing Remarks

Spontaneous Dimensional Reduction?

Diffeomorphism Invariant Gauge Theories

Scenes From Polymer Quantization

Promising Paths: What Have We Learned So Far About Quantum Gravity?

Quantum Foundations - 1

Discrete Approaches - 2

Phenomenology - 3

Phenomenology - 4

Discrete Approaches - 3

Group Field Theory and Tensor Models - 2

Canonical Quantum Gravity - 4

Closing Remarks

Spontaneous Dimensional Reduction?

Diffeomorphism Invariant Gauge Theories

Scenes From Polymer Quantization

Promising Paths: What Have We Learned So Far About Quantum Gravity?

Quantum Foundations - 1